Hi Sherrick,
Welcome to the Heartland Owners Forum.
I've never seen a chart of light bulb types/#s, and of course bulb usage has changed over time and no doubt will continue to change. Perhaps someone with another 2009 Bighorn can shed some light on the scare light bulbs.
Btw, If you want to avoid getting up on the ladder, I'd suggest replacing them with LEDs. The life of incandescent bulbs is pretty short compared to an LED.